just as an FYI 36 caliber is in reality 375 diameter.
Nope, 375. In American parlance, a .357 is a .38..357, surely?
The ones that really get me are the ones where it is just a number, with no "cal" after it. You find a lot of model 3 1851s like that, and a ton of 1860 and 1861s. Some of the Colts sent to Prussia and Bavaria even have marks for bore diameter, rather than caliber.